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24 Cards in this Set
- Front
- Back
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Scalar Quantity
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A quantity with magnitude but not direction
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Vector Quantity
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A quantity with both magnitude and direction
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Displacement
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Distance moved in a particular direction
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Instantaneous speed
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Speed at a given instant in time
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Average speed
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Distance covered per unit time
Distance covered/time taken |
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Velocity
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Speed in a given direction
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Acceleration
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Change in velocity per unit time
Change in velocity/time taken |
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Newton
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The net force which gives a mass of 1kg an acceleration of 1ms^-2
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Torque of a couple
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One of forces x perpendicular distance between them
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Moment of a force
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Force x perpendicular distance from pivot
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Thinking distance
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Distance travelled by the car from when the driver sees a problem and the brakes are applied
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Braking distance
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Distance travelled by the car whilst the brakes are applied and the car stops
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Stopping distance
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Thinking distance + braking distance
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Work done
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Force x distance travelled in the direction of the force
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Joule
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The energy required to move a weight of 1N through a distance of 1m
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Power
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Work done per unit time
Or The rate of work done |
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Watt
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Power required to move a weight of 1N through a distance of 1m in 1s
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Stress
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Force/cross sectional area
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Strain
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Extension/original length
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Young modulus
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Stress/strain
(Young modulus = gradient on stress/strain graph in linear section) |
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Ultimate tensile strength
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Maximum stress a material can withstand before fracture
(Breaking stress) |
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Elastic deformation
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Extension is proportional to force as long as elastic limit is not exceeded
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Plastic deformation
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Material does not return to its original length/shape/size when the stress is removed, it is permanently deformed
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Density
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Mass per unit volume
Or Mass/volume |
